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People have been protesting across Iran since mid-September 2022, defying a deadly crackdown by security forces.

The demonstrations are seen as the most serious challenge to the Iranian authorities in decades.

It all started with the death of Mahsa Amini, a 22-year-old woman arrested by morality police in Tehran on 13 September for allegedly violating Iran's strict rules requiring women to cover their hair with a hijab, or headscarf.

There were reports that officers beat her head with a baton. The police said she suffered a heart attack. To support their claim, authorities released footage of Ms Amini collapsing in a police station, but the clip - along with images of her in a coma - enraged ordinary Iranians.

The first protests took place after Ms Amini's funeral in the western city of Saqqez, when women ripped off their headscarves in solidarity.

Since then the protests have swelled, with demands from more freedoms to an overthrow of the state.

Videos have shown them defiantly setting their headscarves on fire and cutting their hair in public to chants of "Woman, life, freedom" and "Death to the dictator" - a reference to the Supreme Leader, Ayatollah Ali Khamenei.

While some women have publicly protested against the hijab before, cases have been isolated and dealt with severely. There has been nothing compared to the current scale.

In an unprecedented show of support, schoolgirls have also been demonstrating in playgrounds and on the streets.

Men and teenage boys have also participated in large numbers and backed the women's demands.

They have played down the protests and tried to suppress them with force.

Ayatollah Khamenei has accused the United States and Israel, Iran's arch-enemies, of orchestrating "riots" - dismissed by critics as fabricated.

The BBC and other independent media are barred from reporting from inside Iran, making it difficult to verify what is claimed by state media. Social media, activists and human rights groups help provide a picture, although authorities have disrupted internet and phone services.

Iran Human Rights, a Norway-based group, has said at least 234 people, including 29 children, have been killed by security forces.

Security forces have denied killing peaceful demonstrators, but they have been filmed firing live ammunition on the streets.

In 2009, millions of people took to the streets after a disputed presidential election. However, the unrest was limited to major cities and was led by the middle class.

Economic hardship triggered nationwide protests in 2017 and 2019, but they took place mostly in working-class areas.

Now though, for the first time, protests involve people from all sections of society and age groups, and have spread across dozens of cities and towns.